ax_struct_semun

Synopsis

AX_STRUCT_SEMUN

Description

This macro checks to see if sys/sem.h defines struct semun. Some systems do,
some systems don’t. Your code must be able to deal with this
possibility; if HAVE_STRUCT_SEMUM isn’t defined for a given system,
you have to define this structure before you can call functions like
semctl().

You should call AX_SYSV_IPC before this macro, to separate the check for
System V IPC headers from the check for struct semun.

Source Code

License

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permitted in any medium without royalty provided the copyright notice and
this notice are preserved. This file is offered as-is, without any warranty.